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Chinese Physics Letters

Competition between stimulated Raman scattering and resonant laser emission

Cheng Bingying, Zhang Jie, Zhang Daozhong, Zhao Lizeng, Zhao Yuying, Wang Tianjuan

Published Jul 1, 1988• 5 citations
Publisher

Abstract

Competitive phenomena between stimulated Raman scattering and resonant laser emission in atomic lead are studied through photodissociation of PbCl 2 with a UV laser. The different dependences of their intensities on the UV power, the density of PbCl 2 and the pressure of buffer gases are investigated. The results indicate that under the conditions of high pump intensity and low buffer gas pressure SRS can have the advantage of RLE.

DOI
10.1088/0256-307x/5/7/001

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Competitive phenomena between stimulated Raman scattering and resonant laser emission in atomic lead are studied through photodissociation of PbCl 2 with a UV laser. The different dependences of their intensities on the UV power, the density of PbCl 2 and the pressure of buffer gases are investigated. The results indicate that under the conditions of high pump intensity and low buffer gas pressure SRS can have the advantage of RLE.
Strong stimulated radiation at wavelengths 3740 A was observed when PbCl 2 molecules were photodissociated by a 2660 A UV laser. Based on spectral characteristics and Pb energy level structure, this radiation was judged to be resonant laser radiation and stimulated Raman scattering due to the populated 6p 2 3 P 2 metastable Pb atoms from photodissociated PbCl 2 molecules. A theoretical model was developed to describe the whole process, and experimentally fitted to determine the photodissociation coefficient of the metastable Pb atoms from dissociated PbCl 2 by 2660 A laser
Under excitation of 355nm or 266nm UV radiation some strong emissions have been observed in PbI 2 vapor. Analysis shows that they are 1st, 2nd order Stokes and 1st anti-Stokes components of 355nm laser and 1st order Stokes and anti-Stokes components of 266nm laser. The initial states of Raman transition are 6p 2 3 P 1 and 6p 2 3 P 2 metastable states of atomic Pb, respectively. The population on it is created by photodissociation of PbI 2 . The dependences of Raman components on pump power, PbI 2 density and pressure of buffer gas are investigated experimentally.
Strong stimulated radiations at wavelengths 3740 A have been observed when PbCl2 molecules are photodissociated by 2660 A ultraviolet laser. Dependences of these radiations on the pump laser intensity and PbCl2 molecular density have been studied experimentally. A theoretical model to describe these processes is put forward. These two raditions are identified as resonant laser radiation and stimulated Raman scattering originated from bhe population of the metastable level 6p23P2 of atomic Pb, which is produced by two-photon dissociation of PbCl2. When molecular density of PbCl3 is 6.21×1016cm-3, the maximum populations on the two metastable levels, 6p23 P2 and 6p21D2, of atomic Pb are almost same, which equals 2.0×1016cm-3.
A large number of Ti atoms populated mainly on the ground state (a3F2) and metastable states (a3F3,4) were produced by UV-laser (259-300 nm) photodissociation of TiCl4. Many stimulated Raman scattering lines and stimulated radiations of Ti atoms were observed by pumping Ti atoms on the a3F2,3,4 states via nearly resonant transitions. All the lines observed were assigned. The pulse duration and timeresolved spectrum of SRS of Ti atoms shows the photolysis of TiCl4 to Ti atom was very fast, and the time estimated for it was less than Ins.
The competition of stimulated Raman scattering (SRS) between 4S-(5P)-5S and 4S-(3D)-5S channels has been observed as a laser is tuned near the 4S-5P resonance in potassium vapour. The experimental results show that SRS only occurs in the 4S-(5P)-5S channel. In this Raman scattering, suppression of the amplified spontaneous emission (ASE) (5S-4P) has been observed. The influence of the four-wave mixing (FWM) processes on the SRS is discussed. In the 4S-(5P)-3D channel, in the backward direction no detectable emission corresponding to SRS (4S-(5P)-3D) has been observed, so the forward (5P)-3D emission should be FWM, not SRS. The ASE (3D-4P) arises from the ASE (5P-3D), which can be observed in the backward direction.
The generation of 145.6-nm radiation by stimulated anti-Stokes Raman scattering in inverted atomic selenium was first reported by Ludewigt et al. 1 We have performed experimental studies of this process in similar excitation conditions, which allow us to compare some of the results in the two studies. The inverted population of the selenium (4p4)1S0 metastable state relative to the (4p4)3P0 state was prepared by photodissociation of COSe vapor using broadband 193-nm radiation from an ArF excimer laser. The pump beam at 205.1 nm was generated by the first-order Stokes shift in deuterium of narrowband (0.27-cm–1), 193-nm radiation from a separate, tunable ArF laser. The pump beam was tuned near the selenium (4p4)1S0–(4p35s)3P1 intermediate resonance to generate tunable, coherent radiation at 145.6 nm. We have studied the process in a variety of experimental conditions. Factors affecting the conversion efficiency and tunability include the initial COSe pressure, the intensities and relative timing of the photolyzing and pump beams, and the presence of buffer gases. The experimental results are compared with theoretical calculations based on a recently developed three-level model2 which incorporates Doppler broadening and arbitrary decay times.